Research On Electronic-scan Phased Array Radar Signal Sorting Method

With the development and maturity of radar technology,radar reconnaissance system faces many new-style modern radars with complicated systems in complicated electromagnetic environment.Electronic-scan phased array radar is multi-function radar which adopts phased array antenna,and which is electronic scanning in azimuth an elevation.The antenna beam shape agility,rapid scanning of antenna beam,adaptive spatial filtering,adaptive space-time processing capacity,and a variety of signal waveform work mode,so that the electronic-scan phased array radar has become one of the most promising radar systems.More and more electronic-scan phased array radars are applied to military equipment,which formed a huge challenge for the radar reconnaissance.Radar signal sorting is a key technique in reconnaissance,which is the basis of follow-up signal and information processing and analysis,therefore,it is of great value to study the signal sorting method of electronic-scan phased array radar.Aiming at the problems of the electronic-scan phased array radar signal sorting,the main work of the thesis is as follow:1.Based on the system structure of electronic-scan phased array radar,the signal hierarchical structure model of electronic-scan phased array radar is constructed,which provides theoretical guidance for the subsequent sorting schemes.Then,the significance of the sorting parameters in signal sorting is expounded.Finally,the partial sorting algorithm is summarized.The dynamic range clustering algorithm and the density clustering algorithm based on data fields are used to sort the pulse sequence containing the electronic-scan phased array radar,the simulation proves that the effect of methods are not ideal,therefore,new method must be proved.2.The data field theory is introduced into the signal sorting.Firstly,the relevant theoretical knowledge of the data field is introduced.Then,the distance and potential difference between sample points are used to find the parent node of each sample point to complete the hierarchical clustering.Finally,the data field and hierarchical clustering simulation based on the sample data consisting of direction of arrival(DOA),carrier frequency(CF)and pulse width(PW)is implemented.The results of the sorting effect of pulse loss and interference pulses are analyzed.The simulation proves that the method is valid for containing the electronic-scan phased array radar signal.3.Study on the signal sorting method that uses the information of multi-platform TDOA which is associated with the space position of radar.The first pulse sequences to master intercepted and pulse sequences intercepted by auxiliary stations are paired with pulses,and then based on the pulse pairing results construct recursive extended TDOA histogram in time sequence retrieval,the master station and different auxiliary station time difference sequence the results of retrieval for time to get the sorting results of multi-platform TDOA sorting.Then,put forward two kinds of sorting methods based on TDOA,one is in the pulse pairing when considering PW,CF and the type of modulation(PM)Multi-platform TDOA sorting method,another is the use of clustering and multi station TDOA sorting method combined.Finally,using two kinds of sorting methods by simulation experiments verify the effectiveness of the algorithm.